Mercurial > projects > ldc
annotate druntime/import/std/intrinsic.di @ 1458:e0b2d67cfe7c
Added druntime (this should be removed once it works).
author | Robert Clipsham <robert@octarineparrot.com> |
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date | Tue, 02 Jun 2009 17:43:06 +0100 |
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1458
e0b2d67cfe7c
Added druntime (this should be removed once it works).
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parents:
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1 /** |
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2 * These functions are built-in intrinsics to the compiler. |
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3 * |
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4 * Intrinsic functions are functions built in to the compiler, usually to take |
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5 * advantage of specific CPU features that are inefficient to handle via |
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6 * external functions. The compiler's optimizer and code generator are fully |
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7 * integrated in with intrinsic functions, bringing to bear their full power on |
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8 * them. This can result in some surprising speedups. |
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9 * |
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10 * Copyright: Public Domain |
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11 * License: Public Domain |
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12 * Authors: Walter Bright |
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13 */ |
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14 module std.intrinsic; |
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15 |
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16 |
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17 /** |
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18 * Scans the bits in v starting with bit 0, looking |
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19 * for the first set bit. |
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20 * Returns: |
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21 * The bit number of the first bit set. |
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22 * The return value is undefined if v is zero. |
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23 */ |
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24 pure nothrow int bsf( uint v ); |
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25 |
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26 |
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27 /** |
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28 * Scans the bits in v from the most significant bit |
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29 * to the least significant bit, looking |
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30 * for the first set bit. |
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31 * Returns: |
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32 * The bit number of the first bit set. |
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33 * The return value is undefined if v is zero. |
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34 * Example: |
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35 * --- |
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36 * import std.intrinsic; |
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37 * |
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38 * int main() |
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39 * { |
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40 * uint v; |
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41 * int x; |
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42 * |
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43 * v = 0x21; |
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44 * x = bsf(v); |
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45 * printf("bsf(x%x) = %d\n", v, x); |
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46 * x = bsr(v); |
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47 * printf("bsr(x%x) = %d\n", v, x); |
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48 * return 0; |
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49 * } |
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50 * --- |
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51 * Output: |
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52 * bsf(x21) = 0<br> |
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53 * bsr(x21) = 5 |
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54 */ |
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55 pure nothrow int bsr( uint v ); |
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56 |
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57 |
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58 /** |
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59 * Tests the bit. |
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60 */ |
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61 pure nothrow int bt( in uint* p, uint bitnum ); |
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62 |
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63 |
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64 /** |
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65 * Tests and complements the bit. |
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66 */ |
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67 nothrow int btc( uint* p, uint bitnum ); |
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68 |
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69 |
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70 /** |
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71 * Tests and resets (sets to 0) the bit. |
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72 */ |
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73 nothrow int btr( uint* p, uint bitnum ); |
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74 |
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75 |
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76 /** |
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77 * Tests and sets the bit. |
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78 * Params: |
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79 * p = a non-NULL pointer to an array of uints. |
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80 * index = a bit number, starting with bit 0 of p[0], |
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81 * and progressing. It addresses bits like the expression: |
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82 --- |
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83 p[index / (uint.sizeof*8)] & (1 << (index & ((uint.sizeof*8) - 1))) |
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84 --- |
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85 * Returns: |
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86 * A non-zero value if the bit was set, and a zero |
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87 * if it was clear. |
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88 * |
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89 * Example: |
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90 * --- |
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91 import std.intrinsic; |
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92 |
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93 int main() |
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94 { |
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95 uint array[2]; |
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96 |
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97 array[0] = 2; |
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98 array[1] = 0x100; |
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99 |
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100 printf("btc(array, 35) = %d\n", <b>btc</b>(array, 35)); |
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101 printf("array = [0]:x%x, [1]:x%x\n", array[0], array[1]); |
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102 |
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103 printf("btc(array, 35) = %d\n", <b>btc</b>(array, 35)); |
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104 printf("array = [0]:x%x, [1]:x%x\n", array[0], array[1]); |
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105 |
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106 printf("bts(array, 35) = %d\n", <b>bts</b>(array, 35)); |
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107 printf("array = [0]:x%x, [1]:x%x\n", array[0], array[1]); |
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108 |
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109 printf("btr(array, 35) = %d\n", <b>btr</b>(array, 35)); |
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110 printf("array = [0]:x%x, [1]:x%x\n", array[0], array[1]); |
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111 |
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112 printf("bt(array, 1) = %d\n", <b>bt</b>(array, 1)); |
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113 printf("array = [0]:x%x, [1]:x%x\n", array[0], array[1]); |
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114 |
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115 return 0; |
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116 } |
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117 * --- |
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118 * Output: |
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119 <pre> |
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120 btc(array, 35) = 0 |
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121 array = [0]:x2, [1]:x108 |
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122 btc(array, 35) = -1 |
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123 array = [0]:x2, [1]:x100 |
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124 bts(array, 35) = 0 |
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125 array = [0]:x2, [1]:x108 |
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126 btr(array, 35) = -1 |
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127 array = [0]:x2, [1]:x100 |
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128 bt(array, 1) = -1 |
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129 array = [0]:x2, [1]:x100 |
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130 </pre> |
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131 */ |
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132 nothrow int bts( uint* p, uint bitnum ); |
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133 |
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134 |
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135 /** |
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136 * Swaps bytes in a 4 byte uint end-to-end, i.e. byte 0 becomes |
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137 * byte 3, byte 1 becomes byte 2, byte 2 becomes byte 1, byte 3 |
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138 * becomes byte 0. |
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139 */ |
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140 pure nothrow uint bswap( uint v ); |
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141 |
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142 |
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143 /** |
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144 * Reads I/O port at port_address. |
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145 */ |
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146 nothrow ubyte inp( uint port_address ); |
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147 |
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148 |
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149 /** |
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150 * ditto |
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151 */ |
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152 nothrow ushort inpw( uint port_address ); |
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153 |
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154 |
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155 /** |
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156 * ditto |
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157 */ |
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158 nothrow uint inpl( uint port_address ); |
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159 |
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160 |
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161 /** |
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162 * Writes and returns value to I/O port at port_address. |
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163 */ |
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164 nothrow ubyte outp( uint port_address, ubyte value ); |
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165 |
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166 |
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167 /** |
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168 * ditto |
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169 */ |
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170 nothrow ushort outpw( uint port_address, ushort value ); |
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171 |
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172 |
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173 /** |
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174 * ditto |
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175 */ |
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176 nothrow uint outpl( uint port_address, uint value ); |